Miter-cutting machine



(No Model.)

J. W. OLIVER. MITER OUTTINGMAGHINE.

No. 526,634. Patented Sept. 25,1894.

UNITED STATES- PATENT OFFICE.

JOSEPH W. OLIVER, OF GRAND RAPIDS, MICHIGAN.

MlTER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 526,634, dated September 25, 1894.

Application filed May 26,1891. Serial No. 394,181. (No model.)

To all whom it may concern.-

Be it known that I, JOSEPH W. OLIVER, a citizen of the United States, residing at Grand Rapids, in the county of Kent, State of Michigan, have invented certain new and useful Improvements in Miter-Outting Machines; and I hereby declare the following, when taken in connection with the accompanying drawings, which form a part of this specification, to be a full, clear, and exact description of my invention.

This invention relates to miter cutting machines or trimming machines and has for its object improvements adapted to make them {nore positive in action and simpler in opera- In the drawings, Figure 1, is a front elevation. Fig. 2, is a perspective seen from the rear. Fig. 3, is a section, lengthwise of the central bolt. Fig. 4. shows a trimmer with some modifications.

B, indicates the main table or bed plate of the machine at the'front edge of which is a hanging flange B, and at the middle of the flange B, is a bolt hole through which passes the central pivot c, on which all the operative parts of the machine swing. Thesein the order in which they are located forward of the hanging flange B, are, first, the knife frame A; second, a spur gear 5, and united to the spur gear 5, is a ratchet wheel 3, spaced from the spur gear 5, but united to it by a neck It. On the neck It, and on a hub on the ratchet gear 3, is journaled the forked lower end of the ratchet actuating lever H. All these parts are held together by the pin a, and the two burrs n, n. The knife holding frame A, has at its ends, bolts 2, 2, which pass through holes in the frame A, and through slots t, t, in the hanging flange B. The frame A, supported on the central bolt 0, can swing until the track which it carries rests at an inclination to the surface of the bed B, and it can then be secured by the bolts 2, 2, in its inclined position.

The upper part of the frame A, is provided with a groove and the lower part with a feather, and secured within the frame held by the groove and the feather which engage in suitable running parts, is a knife plate E to which are secured knives E, E. The cutting edges of these knives diverge from each 7 other at an angle of about ninety degrees.

They are arranged to shear closely with the front side of the bedB.

At the ends of the frame beyond the posts which support the upper bar of the frame, are two extensions a, a, arranged to guard the edges of the knives from being accidentally struck by anything that will injure them or by anything that they willinjure.

The knife plate E is reciprocated by the lever H, the lower end of which is forked, and which carries between the prongs of the fork a double pawl 19, 19, one part of which engages the teeth of the ratchet wheel when the lever is actuated with a right hand motion, and the other part of which engages with the ratchet wheel when the lever is actuated with a left hand motion. Both the pawls can be thrown out of engagement when it is desired to do so by pushing inward the arrow headed plunger 1), the head of which acts as a wedge between the nearly parallel pawls and spreadsthe points of the pawls apart from one another throwing both out of engagement with the ratchet Wheel. Normally the points are held in engagement with the wheel by a spring 3. The plunger b, is normally held in position to leave the pawls free to act by a spring 7.

On the knife frame E is a rack 6, of which the teeth are presented downward thus protecting the teeth from dust, dirt, shavings, drc.

At each end of the bed B, are adjustable gages D, which regulate the angle at which the work is presented to the knives.

The guides D, are triangular in horizontal cross section and provided with dowels on the bottom which engage in two grooves g, g, in the bed-plate. These grooves are circular arcs concentric, and having their common center in a line which forms the meeting edge or shearing edge between the knives E, and the front angle of the gage. Between the grooves g, g, is a groove S, through which passes a bolt having a head on the lower side of the table, and the upper end of the bolt passes through the base plate of the gage D, Where it engages with a cam lever K, and by means of the bolt and the cam lever the gage can be secured in any desired position.

In the modification shown in Fig. 4:, there are on the knife frame A, two lugs m, through which pass pins rising from the upper side of the iga'g'es. *vv l enthesepinsare employed in connection with the lugs the knife frame must be secured rigidly to the hanging flange B, so that it will not swing on the pin a. The entire machine is supported -pr eferably on a tripod and is placed on the-head O, of the tripod, and is secured thereto by a screw d, (as shown in Fig. 2,) orby aclamp; d, as shown in Fig. 4. The entire machine is adjustable around the head of the tripod. WhatIclaim is p H 1. In a miter cut ing machine, the co trrbi nation of the bed B, the centrally pivoted, vertlcally swinging frame A, knife plate 131?, slldlng therein, the inverted rack and gear wheel, the actuating lever and the 'boltc,

uniting the-swinging parts to the 'bedB.

2. In-a miter cutting machine, the'colirbi nation of a centrally pivoted, vertically swinging knife frame, knivesada'pted'toslide therein, an "actuating lever :pivoted onthel knife frame pivot and means intermediate the lever and knives whereby the knives are actuated, the bed having cdncen tr'icgroov es ing the gages to the bed, substantially as described. c

3. 'Ina miter cutting machine, the combination of a centrally pivoted, vertically swinging frame and knives sliding therein, the tripod head 0, means for securing the bed to the tripod head adj ustably and means -for clamping the bed in its fixed jposition, substantially asand for the purpose specified.

4. Ina-miter cutting machine, the combination of the bed, B, with adjustable gages, the centrally pivot-ed, "Vertically swinging frame, A, the sliding knifie plate and knives E, the inverted rack and gear the a'ctha'ti-ng lever adjustable on said 'geai3subsfta2ntially as described.

Witnesses:

ALFRED WoLeo'rr, HORTON H. DRURY.

JOSEPH W. omvER. 

